To make Dudhi-Coconut Halwa, grate the bottle gourd (dudhi) and squeeze out the excess water. Heat some ghee in a pan and sauté the grated bottle gourd. Add milk and sugar to the mixture, and cook for 10 minutes. Then, add grated coconut and grated *pedas* (milk sweets) to the pan. Mix everything well, cook for a a while longer. Finally, add milk powder, combine all the ingredients thoroughly, transfer the halwa to a serving dish, garnish with pistachios, and serve hot.